Originally Posted by
cdelong
the taper at the conical end of the plug is most likely different- possibly the threads as well. It's best to stick with the Ninja plugs on the Ninja.
I know an OS turbo plug will not thread into a Nova head button- same concept.... it just doesn't jive.
Boss and Falcon plugs are identical to the Mugen plugs...The Boss engines are a mirror brand of the Ninja motors, the Boss products even come on fancy plastic cases just like the Ninja products....... Boss=Ninja and Ninja=Boss